In Gideon v. Wainwright, twenty-three state attorneys general, led by Walter F. Mondale and Edward McCormack, joined an amicus brief on the side of the criminal accused, urging the Supreme Court to recognize indigent defendants’ Sixth Amendment right to appointed counsel in felony cases. This was a unique occurrence. Although amicus filings by public entities have increased significantly since then, including in criminal cases, government lawyers rarely submit amicus briefs in the Supreme Court supporting criminal defendants’ procedural rights, and never en masse as in Gideon. The states’ public support for Gideon’s position points up the special nature of the right to a defense lawyer — a right that is fundamental to a fair trial and to av...